diff --git a/scripts/flash-one.sh b/scripts/flash-one.sh
index 17410dd..23d6949 100755
--- a/scripts/flash-one.sh
+++ b/scripts/flash-one.sh
@@ -40,8 +40,15 @@ sleep 1
 
 # --- grow root partition to fill the disk ---------------------------------
 echo ",+" | sfdisk --no-reread -N 2 /dev/$DEV
-partprobe /dev/$DEV
-sleep 1
+for i in $(seq 1 10); do
+    partprobe /dev/$DEV 2>/dev/null || true
+    udevadm settle 2>/dev/null || true
+    umount /dev/${DEV}1 /dev/${DEV}2 2>/dev/null
+    SIZE2=$(blockdev --getsize64 /dev/${DEV}2 2>/dev/null || echo 0)
+    [ "$SIZE2" -gt 200000000000 ] && break
+    sleep 1
+done
+[ "$SIZE2" -gt 200000000000 ] || fail "kernel never saw the resized partition"
 e2fsck -fp /dev/${DEV}2 >/dev/null
 resize2fs /dev/${DEV}2 >/dev/null
 
@@ -49,8 +56,12 @@ resize2fs /dev/${DEV}2 >/dev/null
 B=/mnt/planck-boot
 R=/mnt/planck-root
 mkdir -p $B $R
-mount /dev/${DEV}1 $B
-mount /dev/${DEV}2 $R
+for i in 1 2 3; do
+    umount /dev/${DEV}1 /dev/${DEV}2 2>/dev/null
+    mount /dev/${DEV}1 $B 2>/dev/null && mount /dev/${DEV}2 $R 2>/dev/null && break
+    sleep 2
+done
+mountpoint -q $B && mountpoint -q $R || fail "could not mount partitions (desktop keeps grabbing them)"
 
 # enable ssh on first boot
 touch $B/ssh